Area of a semicircle with a radius of 3

9π/2

Step-by-step explanation:

A semicircle is half of a circle. Therefore, you must divide the area by 2.

Since we know the radius, we can directly plug it into the formula.

Since the problem stated to give the answer in terms of π, 9π/2 is our answer.

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.